Electrical fuse



June 9, 1925. -1,541,652

. A. J. MATTER ELECTRI CAL FUSE Filed Jan. 14, 1921 WYTMSSES: [NVE/VTOR."

MW v cf (S retaining terminal plug.

Patented June 9, 1925. 1

ALBERT J. MATTER, OF CHICAGO, ILLINOIS.

ELECTRICAL FUSE.

Application filed January 14, 1921. Serial No. 437,149;

To all wlmmz't may concern Be it known that ALBERT J. MATTER, a citizen of the United States, residing at 919 Cornelia. Ave, Chicago, 111., has in vented new and useful Improvements in Electrical. Fuses, of which the following is a specification.

This invention relates to improvements in electrical fuses and more particularly to that type known as renewable fuses of the screw plug type.

The objects of my invention are; to provide a fuse of this type which may be manufactured with a minimum of insulating material; a minimum. number of parts; inexpensive methods of assembling the various parts; insulating parts easy to mould and without threadsor inserts to hamper high speed economical production; to provide an inexpensive, easily replaced fusible member; and etlicient control of the explosive gases emitted when the fuse blows I attain these objects by means of the improvements herein described and illustrated in the accompanying drawings in which,

Figure 1 is a sectional elevation of the fuse.

Figure 2 is an elevation partially in section showing a modified form of fuse hold ing terminal plug.

Figure 3 is a bottom view of the cap member shown in Figure 1 and shows the case retaining groove and transparent observation center. I 4

Figure 4- illustrates the fusible member shown in figure 1. in extended form.

Figure 5 shows a modified form of fuse Figure 6 illustrates st'll another method of modifying the form of the fusexretainlug terminal plug.

Like numerals of reference indicate similar parts throughout the several views.

Referring to the drawings, l-indicatcs -a ring shaped cap member, pre'teralilly made of mouldable insulating material and provided with a central orllice 2, a case retainmg groove 3 and indenting recesses 4:.

5 is a metalliccase, cup shaped and proride-d with screw tl'ireads, (5 or other fuse receptacle eugaging and holding means and havingan orifice 'ttlrrrougzhv the bottom, said bottom portion surrounding said orifice be ing preferably formed with an inwardly extending flange as shown.

To attach the case 5 to the cap 1 it is inserted in groove 3 and locked therein by means of indentations 8 formed in the'case 5, with a pointed indenting punch inserted temporarily for this purpose in recesses 4 and forming the indentation by force. This permanently locks the edge of the case with in the groove of the cap.

Orifice 2 is so formed as to present a shoulder at 9. A transparent observation disc 10, preferably made of mica or other transparent insulating material is forced into the orifice 2 and against the shoulder 9.

Referring to Figures 1 and 4, 12 indicates a fuse holding terminal. plug perforated at 13 and having a'fiange 14. This plug is preferably made of moulded insulating ma terial. 15 is a flat strip of fusiblematerial such as zinc and adapted to convey a predetermined amount of electric current. Fuse member 15 has its two ends inserted through orifices'13 and bent back a ainst slight'pressure will force it securely into place.

Fuse member 15 is preferably provided with perforations 16 so as to diminish the cross sectional area at these points of the fuse member thus causing it to fuse at the .sides of the perforations when the electrical current exceeds that for which the fuse is designed, thereby severing the fuse member at these points and permitting intermediate parts to dro away so as to completely break the electrical circuit.

The complete fuse as described comprises a threaded case of electrical current conducting material. a cap therefor composed of non-conducting material a use holding terminal plug composed of nonvconducting material and a fuse member of fusible electrical current conducting material whose ends come in contact with the case and whose intermediate portion 1.5 forms a terminal contact point.

In use the fuse is screwed into the usual threaded fuse receptacle so that the terminal 2 the fuse plug 12 i perforation 17, a rec l lhe modification shown in Figure 5 illustrates afuse plug 12 perforated at 21, flanged at 1 and recessed at 22. 23 is a metallic terminal post provided with a fuse attaching screw 24-. and having a terminal contact head 2G is a fuse member perforated to receive screw Q-l and arranged to fit into recesses 22. A metallic fuse holding ring 2'? is adapted to snugly enclose the fuse ends and is arranged to come in contact iv'th the case 5.

In Figure 6 the fuse plug 12 is shown perforated at 28 and flanged at M. 29 is a metallic terminal post which is slotted at 30 to receive one end of a fuse member 31 and is provided with a terminal contact head Tie plug 12 s provided with a recess 33 adapted to receive one end of fuse member 31 and'hold in contact ass is unde stood that ho lin furrher modified in a fuse of this prising a case, cap and plug.

What is claimed is:

1. The combination of a metallic case having on inturned edge, a non-conducting cap permanently attached thereto, a fuse and non-conducting plug carried by said metallic case ada ted to hold the fuse between it and the mturned edge the case.

2. lhe combination of a metallic case havin an inturncd edge a non-conducting non-threaded cap attached thereto, a fuse and a non-conducting plug adapted to hold the fuse between it and the inturncd edge of the case. 7

3. The combination ol a threaded metallic case having an inturned edge, anon-conducting non-threaded cap alt. ched thereto, a fuse and a non-conducting plug adapted to hold the fuse between it and the inturned edge of the case.

l. In a renewable fuse the combination of a threaded case having an inturned edge. a non-threaded cap attached thereto and a removable plug adapted to hold a between it. and the inturned edge of the case.

the niethoo of 1 mamas In a renewable fuse the combination with a fuse case of a cap having a groove adapted to receive the edge of said case and provided with orifices through the side thereof for the purpose of indenting the tral orifice and having atransparent closure for said orifice and a renewable nonthreaded plug adapted to hold a. fuse bctwcen it. and the inturned ed e of the case.

8. In a renewable fuse the combination with a fuse case of a. ring'shapcd insulating cap having groove and radially disposed perforations leading through said cap to said groove for the purpose set; forth.

9. In a rcnewzble'fuse the combination with a fuse case of a cap having a groove adapted to receive the edge of said case and having recesses extending to said groove and indentations applied to the edge of said case within said groove through said recess for the purpose of fastening said case to the aforesaid cap.

10. In a renewable fuse the combination with a case of an insulating perforated cap having a transparent center and provided with a groove and radially disposed perfoons through said cap to said groove for purpose set forth.

rati the 11. In a renewable fuse the combination with a case having an open end of an insulating perforate-d cap having an annular groove adapted to receive the open end of said case after said cap is completed.

12. In a renewable fuse the combination with a case of a. perforated cap having an annular groove adapted to receive the edge of the case after the cap is made and provided with radially disposed indentations into which the edge of the case is criinped.

13. The combination with a case having an inturncd edge of a perforated fuse holding plug adapted to hold a. wire-nail-shapod fuse in said perforation and in direct contact with said case one end of said fuse being held between the plug and the inlurncd edge of said case.

14:. The combinal ion with a fuse (use having an inturned edge. and a renewable, perforated, non-threaded plug of a Wire-nailshaped fusible current coiuhu'tin" fuse member having an enlarged terminalhead, said fuse member being adapted to pass through said plug with the enlarged head adjacent and outside of said plug and the opposite end held between the plug and the intiu'ned edge of said case.

15. In a renewable fuse the combination with a cup-shaped metallic fuse case having a perforated bottom, of a nou-eondiiwting rap having annular recesses therein and adapted to receive the open end of said case so that the edge thereof may be indei'ited into said recesses for the purpose of seenr ing said cap to said base.

16. In a renewable fuse having a removable insulating fusible member holding plug, a, metallic cup-shaped ease having a perforated bottom with an axially disposed of said perforation, adapted to receive inturned annular flange adjacent to the edge said plug.

17. In a renewable plug having a removable insulating fusible-element holding plug, a metallic cup-shaped ease having a perforated bottom with an axially disposed annular flange adjacent to the edge of said perforation, adapted to receive said plu In testimony whereof, I hate signed my name to this specification this 11th day of January 1921.

ALBERT J. MAIFJTER. 

